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Related Experiment Videos

Screw migration from total knee prostheses requiring subsequent surgery.

Steven N Shah1, David J Schurman, Stuart B Goodman

  • 1Division of Orthopaedic Surgery, Stanford University School of Medicine, Stanford, California 94305, USA.

The Journal of Arthroplasty
|October 11, 2002
PubMed
Summary
This summary is machine-generated.

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Hardware failure in total knee arthroplasty is uncommon. This report details two cases of symptomatic screw migration into the knee joint, requiring surgical intervention for removal or revision.

Area of Science:

  • Orthopedic surgery
  • Biomedical engineering
  • Materials science

Background:

  • Total knee arthroplasty (TKA) is a common procedure for end-stage knee arthritis.
  • While generally successful, complications can arise, though hardware failure beyond polyethylene wear is rare.
  • Understanding potential failure modes is crucial for improving implant design and patient outcomes.

Observation:

  • Two distinct cases of symptomatic screw migration into the joint space following TKA are presented.
  • Case 1 involved a screw disengaging from a constrained condylar knee prosthesis.
  • Case 2 featured screw disengagement and posterior migration from the tibial component of a posterior-stabilized prosthesis.

Findings:

  • Screws dislodged from TKA components can migrate into the joint space, causing symptoms.

Related Experiment Videos

  • Arthroscopic removal was successful in one case of screw migration.
  • Revision surgery, including polyethylene insert and screw replacement, was necessary in the second case.

    • Implications:

    • These cases highlight a rare but significant complication of TKA hardware failure.
    • Attention to screw fixation and implant design may be warranted to prevent such occurrences.
    • Prompt diagnosis and appropriate surgical management are essential for addressing symptomatic screw migration.